Carl schumann



'tniti taire ggatmt ffrr.

CARL'SGHUMANNy OF FREIBERG, SAXONY, ASSIGNO'RA TO EDWARD H. JACKSON, BOSTON, MASSACHUSETTS.-

Letters Patent llro. 73,053, dated January 7, 1868.

IMPROVED RoemsILLING Madame.

TO ALL WI-IOM IT MAY CONCERN:

Be it known that I,. CARL SCIIUMAN)'1,-of Freiberg, in the Kingdom of Saxony, have invented a new and useful Improvement in Rock-Drills to be 'worked by compressed air or steam; and I do hereby declare the following to be a full and correct description olf the same, whereby any one skilled in'the art to which my inventi'onnappertains will be enabled to understand and construct the same, reference being-had to the accompanying drawings, making part of this specification, and n which- Figure l is a side elevation of my improved rock-drill.

Figure 2 is a plan view, and

Figure 3 an end view of the saine,

Figures 4, 5, and 6 are detail views of parts ofthe same.

Similar letters of reference indicate corresponding parts in the several figures. Y

The nature of my invention consists in ,novel means by which the drill is rotated atl every stroke, and also moved forward as thehole which is being drilled becomes-deeper.

A A, in the drawings, represent the two guide-piecesof the frame, passing-through' the head-piece B, and being held theretoby screw-nuts a. At the opposite `ends the said guide-pieces pass through eyes in the bent .cross-piece C, to which they are secured by pins ZJ. The guide-piece A is provided with a screw-thread, a', and both A and A haven. longitudinal groove on their inner faces, 'in which grooves the'ends of' the guide b move. D D" represent cross-pieces, sliding on the guide-pieces A A', and forming with their central parts the heads of the steam-cylinder E, the pston-rod E of which is provided with a socket for-the reception of the rock-drill F.

On the upper cylinder-head is formed a narrow neek,'c, on which a'ratehel'.wheel,- c',- plays loosely. The rear end of the piston-rod E passes through the neck c andratchet-wheel c', and is smaller inl diameter than the fron-t portion, and is provided with a shoulder, d, corresponding with a groove in the ratchet-wheel c', s that when the 'latter is turned, the piston-rod E and drill F will be turned with it. The pistonjrod E,' at its rear end, passes throughthe guide b,'a shoulder on the rodresting against the under side of the eye bi of the guide, and a. nut securing the rodon thel opposite slide. On the cylinder` and the cross-pieces D D is arranged the valve-chamber Gthe back plate, G', of which is provided with two arms e e, which form a bearing for a shaft,.s, to which are keyed or otherwise. secured the two curved levers e e A link,f, is connected .to the guide-rod f', and a lever, g, plays loosely in a slot in the guide-rod g. An arm or lever, L, projects downwardly from the shaft a, and is formed with two ends or forks. The two curved levers e e pass through slotsin the guide 6,,so that when the piston-rod E is forced backward, the levers e'g will be `moved'so as to turn the shafts, to which they and the other levers and arms above specified are attached. The valve-rodj is provided with a screwthread, and passes through a` small bar, 'z', betweenl the two' forks of the arm or leder h. Two toothed wheels 7c, one above and one below the b'ar t', are provided with femalelscrew threads, so that heycan be screwed up or down on the valve-rod These wheels are kept in position by means of the shoulders Zon the bar l', which catch in between the teeth ot' the wheels lc. The bar npasses .through a slot in the bar Z, and is held in position by a pin, i. The guide-rods'f and g each pass through two guide-pieces m and n, two of each being on each sideof the cross-piece D. I Pivotecl tothe guide-rodfl isazpawl, 0, held against a ratchet-wheel, H, by av spring, o, and pivotedto the guide-piece n is a pawl, o2, also' held-by a spring, and which serves to retain the ratchet-wheel II inv position after having been moved by the pawl o. Pivoted to the guide-piece m, through which the guide-mdf passes, is a pawl, p, held in position by a spring, p1, against the teeth of the., ratchetwheel c', and pivoted on the guide-rod g is pawl, 2J, also acted upon -by a spring., which pawl p2 operates the ratchet-wheel c. I I are two semicircular hollow pieces, provided with two shoulders .I J7, which shoulders, J, have each a mortised groove, 1, into which fits a tongue, s, on the shoulder k of a cylinder, which passes through the cross-piece D, and on the other end of wlii-ch is formedit-he ratchetwheel H, bearing against thercross-piece D. VThe two pieces I I are retainedimposition by means of the circular clamp L, which is held in a closed state by thehead of the thumb-screw 't,'the. latter vpassing, through the part t, and being turned until the clamp seizesthe pieces I I tightly, and holdstlie'm'iirmly on vthe screw-threa l a, so that when the handle-part M of the clamp is turned outwardly, it will rotate the cylinder and ratchet-wheel H, they being held to the piec'es I I' by' means of the'tongue s and groover, and thus force the whole drilling-apparatus forward on the guidopicces A A'. When turned inwardly, however, the clamp L slides over the surface of the pieces I I', which are prevented from rotating by reason of the pawloz. preventing the ratchet-wheelH from turning.

The operation of the machine is as follows: Condensed air or steam being admitted into the cylinder at ar, the piston-rod is forced backward. The motion of thefguide b operates the levers e e', which in turn operate the linkf, so as to throw the guide-rodf forward, and thereby operate the pawl o against the ratchet-wheel II, turning the same by one tooth. At the same time the lever 71. is lifted, and in.turn lifts the valve-rodj, by means ofthe upper toothed wheel lc, and thus operates thevalvle, whilst the lever g, moving forward in`the slot of the guide-rod g', pushes the same `forward, thereby moving the pawl p2 forward also, which slips over the teeth of the ratchet-wheel c; this ratchet-wheel being held in position by the pawl p. -When thc piston-rod is forced forward, the levers e' e' are moved in the contrary direction by the guide 111.' The linkf draws 'back the guide-rodf, whichl allows thepawl o to slip over the teeth around the ratchet-wheel H, until at the end of the movement it again catches against one of the teeth, the wheel being kept in position by the pawl 0.2. The forked arms of the lever 71. are again depressed, and by operating on the'lower toothed wheel k, move the valve-rod forward,vso as to again operate the valve, and the lever y., moving backward in the slot ofthe guide-rod gi draws the same backward as well as the pawl p2, which latter rotates the ratchet-wheel c', and with it, by reason ofthe shoulder'd, corresponding with the groove in the ratchet-wheel c', the piston-rod E', and drill F.V Ordinarily, when the rotationA of the wheel H moves along the whole drilling-device sufficiently fast, the handlepart M of the clamp L will rest against the cylinder, but when -it is desired tol operate the drill faster than it can be done by the action of the levers,an d pawls, it is only necessary to operate the clamp, which, in moving it towards the valve-chest, slips over the' pieces I I';V but in moving it away fromthe valve-chest, it will rotate the pieces I I', and with them the ratchet-wheel H, and force-the whole device forward regardless of the move ment by the .pawl-and-lever device. The valve-rodj can be adjusted to a. shorter or longer 'stroke, by taking out the pin i' and removing the bar Z', which leaves the toothed wheel k free to be moved forwarder backward to any position desired. By replacing the bar. Z', so that the shoulders Zwill catch between theteeth of the wheels 7c, and replacing the pin z", the wheels--c are again in position to be operated on by the forked arms of the lever h. To the rear of the centre of the head-piece B is secured a screw-rod, z,'upon which is arranged to slide freely a holder-piece, u, which is held indany desired position on the screw-rod z by means of nuts u 11,'

placed one on either side of the said holder. O n one side ofthe holder u projects al small screw-rod, 4, upon which is arranged'a clamp, formed of two jaws 2 2, hinged together, as' shown in g. 3. In these jaws 'are vtransverse grooves, forming, when closed, a circular groove, 5. Outside of the said jaws is a nut, 3, by which thejaws are held in a closed position. The object of this device is toenable the drill to be held at any desired inclination, and allow it to be easily adjusted to di'erent positions, either horizontally or vertically. The hole 5 in the clamp 2 2 is designed to grasp an iron rod or bar, by means of which the drill may be sustained at its rear portion.

The machine is designed to be held in a frame, provided wiih projecting bars or pins, so arranged as to admit of its being inclined upward or downward at its forward or drilling end, as circumstances require.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, iSdl. Imparting a forward and rotating' movement simultaneously to the valverodof a rock-drill, by means of the levers e' e', and their connections, substantially as described.

2. The rotating-device, consisting of thelevers e' c', operated by^means of the guide-b, on the piston-rod E', the linkf, guide-rod f', pawl o, pivoted on the guide-rodf', pawl og, pivoted on the 'guide-piece 11, and the guidepieces m n and ratchet-wheel H, substantially as described. i l

3. The device for 'operating the valve-rod, consisting of the levers e e', operated as described, the forked lever L, toothed wheels 7c 7c, screwrodj, bar z', and bar Z', provided withshoulders l, substantiallyV as described.

4. The device for rotating the piston-rod and rock-drill, consisting of the levers c' e', operated as described, lever g, slotted guide-rod g', pawl p, pivoted to the lguide-piece m, guide-pieces m and In., shoulder d, and the piston-rod E and slotted ratchet-wheel c', substantially as described. v

5. The combination of the pieces I I with the lmortised shoulders J, cylinder K, with tongue s, clamp L,

and ratchet-wheel H, operated' substantially Vas set forth.

6. The arms e e, extending from the back plate G of the valvechest G, forming the bearing of the main shaft of the device, substantially as described.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

CARL SCHUMANN.

Witnesses:

FRIEDRICH ZUNTzPY, H. T'. FEIDNER. 

